Turning on SLI on my m1730 results in the machine hanging hard; screen goes black (ie off) where I would usually see the nvidia logo come up when x starts, and cannot switch to consoles/ttys.

I've attached the nvidia-bug-report. This will show the xorg.log from a good boot. I've also attached the xorg log from the previous boot where it hung. It stops right after where it says "NVIDIA SLI enabled" :-(.

FYI, I also tried with a fresh xorg.conf generated by nvidia-xconfig (file attached, but obviously have changed SLI to off). Same result; machine hung hard at where the nvidia splash screen was expected when SLI was turned on.

I just tried the 190.32 beta drivers hoping against hope that SLI would work in the new series. No dice, exactly the same behaviour.

The machine hangs HARD as X is trying to load, and my only option is to hit the big red switch.
This means I can't generate a 'correct' bug report. I'm still using Ubuntu 9.04 (with all the latest updates).

Attached is a Xorg.log.old file that shows where it hangs. I've also attached a bug report. Note that this bug report was from when I switched SLI off in the hope it gives you some additional info.

Just tried the 190.42. SLI still causes a hang, but now when SLI is off the machine also hangs hard on a single GPU!
With SLI off, the LCD backlight stays on when it hangs, but with SLI on the backlight is not on when it hangs.

The attached bug report was run by booting into recovery mode (single/root). So some of the info is not actually correct, eg the dmesg, the kernel version uname is an older version than the up to date one I actually run etc.

Just tried the 195.22 beta quickly. SLI no longer hangs (Yay! ), but:
- when SLI is "On" or "AFR" the entire screen flashes white once some 3D is 'started'. Eg when Compiz 'animation' like the 3D Cube, the entire screen will start flashing white over the desktop and continues to flash white until the compiz 'animation' is finished AND you click somewhere on the desktop with the mouse.
I nearly had an epileptic fit !
- I did briefly try running the Lightsmark benchmark on AFR, and besides the white flashing, it was reporting SLI equivalent framerates, so it was working. There was a crash at one point, but it was not related to the white white flashing, which is more of a problem at the moment...
- when SLI is "SFR" then the bottom half of the screen 'flashes', but not white like the above, so it is more epileptic friendly . Like above, clicking with the mouse stops it.

Log attached, though I don't think it will show anything too interesting....